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DrWatson

On board inverter, how small is too small?

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Sorry, D1-4 ? Volvo Penta? There is a D1-30, or a D2-40 is that it?

If it's a D2-40, then the alt is stupid, not smart, and does 14.4v that is not adjustable. The only adjustment is a yellow wire that can be connected direct to battery as voltage sense, and will compensate for voltage drop, like for a diode splitter.

Otherwise, these are fixed voltage. Any alterations void engine warranty according to VP.

VP have had quite a few issues with failed electronics control interface (start, stop, instruments etc connect to that). Apparently it's very voltage sensitive.

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Yes D1-30, sorry. Wrote that at midnight on my phone not proofreading

VP have had quite a few issues with failed electronics control interface (start, stop, instruments etc connect to that). Apparently it's very voltage sensitive.

That might be why the yard stuck with the lead acid start battery...

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Our current boat came with a 1800W pure sine wave thingy. It wasn't on our wish list of must-have accessories but we now love the convenience of being able to run some pretty useful gadgets to make family cruising easier e.g. toaster for the morning routine and even a small (1400W) hair-dryer. In my experience being able to provide the wife with option of a hot shower and blow-dry makes the cruising season that bit smoother...

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I had a cheap not-pure sinewave inverter & tried charging my laptop - the switched mode power supply in the laptop charger had an issue & self destructed.

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In my experience being able to provide the wife with option of a hot shower and blow-dry makes the cruising season that bit smoother...

 

Completely agree and we have the hot shower covered. To be honest however, I’ve not ever seen Christina use a hairdryer in the 10+ years we’ve been together...

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I picked up this one from Smart Marine for that exact purpose... charging the laptop. Plugs into the 12-volt but you have to have the engine running when you use it.

Works pretty well, although it does get a bit hot after 20 minutes or so. And not too costly.

https://www.smartmarine.co.nz/product/10907/pw150-pro-wave-pure-sine-wave-inverter-150-watts

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I T is correct if you have a dedicated laptop that your using for onboard then it’s own DC supply is the best way to go.

We have two of these for charging random small devices and the likes of phones, tablets, kindle, rechargeable spotlight and electric razor etc. great when you have random crew joining the boat.

https://www.jaycar.co.nz/400w-24vdc-to-240vac-modified-sinewave-inverter-with-usb/p/MI5135

 

However in looking for that link this looks idea also https://www.jaycar.co.nz/200w-inverter-with-4-usb-outlets/p/MI5131

Definitely not the most efficient way, but I’m finding you can’t have enough USB chargers nowadays

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Lots of 'laptop' talk but does that apply equally to 'tablets'?

Tablets usually charge with a USB lead so all you need is one of these

https://www.jaycar.co.nz/usb-and-12v-cigarette-lighter-power-socket-switched/p/PS2036

or even a simple 12volt USB plug but some are 1A and you need a 2.1A ? from memory to charge a tablet with any speed https://www.jaycar.co.nz/qualcomm-quick-charge-2-0-usb-charger/p/PS2032

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